James, J., Meenakshisundaram, Sankar  ORCID: https://orcid.org/0000-0002-7105-0203, Senthil Kumar, S. and Nair, K. V. O.
2004.
Preparation and properties of Ba2−xSrxSmTaO6 (x=0–2): a group of new perovskite materials.
Materials Chemistry and Physics
83
(2-3)
, pp. 328-333.
10.1016/j.matchemphys.2003.10.007
|
Abstract
A new group of complex oxide materials were synthesized by the conventional solid state method. These compounds have the general formula Ba2−xSrxSmTaO6 (x=0, 0.5, 1.0, 1.5 or 2) and complex perovskite structures. The compounds belonging to this Ba2−xSrxSmTaO6 group exhibited a regular transition from the ideal cubic structure to a pseudocubic structure as the strontium content is increased. Pure Ba2SmTaO6 gave an ideal cubic perovskite crystal structure of A2(BB′)O6 type, while pure Sr2SmTaO6 was found to have a pseudocubic structure. The unit cell dimensions of these compounds varied from 8.4687 to 8.3232 Å as the amount of Sr (x) in Ba2−xSrxSmTaO6 increased from 0 to 2. The theoretical density of these samples also decreased from 7.6756 to 6.9401 gm/cm3 as the value of x is changed from 0 to 2. All these powders could be sintered to more than 90% theoretical density at 1650 °C in 4 h. These compounds were found to be thermally stable and did not show any phase change. They had dielectric constants in the range 14–18 and the loss factor values were about 2×10−3 at a frequency of 107 Hz. These Ba2−xSrxSmTaO6 ceramics gave moderate values of dielectric constant and loss factor, in the range suitable for use as substrates for superconductors.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Research Institutes & Centres > Cardiff Catalysis Institute (CCI) Schools > Chemistry |
| ISSN: | 0254-0584 |
| Last Modified: | 27 Oct 2022 08:19 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/61949 |
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